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Last updated: 4 July 2025
Solar hot water system cost guide
As the world turns its attention to cleaner power, solar thermal systems are becoming an increasingly popular solution for homeowners. By drawing power from the sun, these systems transfer the heat straight into your hot water supply. The result is emission-free hot water for you to wash, do the dishes and clean your laundry. But how much does a solar hot water system cost?
Not only are solar water heating systems beneficial to the environment, but they're also a great way to save heating costs in the long term. But how much does a solar hot water system cost? To help you budget, we've put together a practical guide to solar thermal system prices.
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| Item | Unit | Cost - low | Cost - high | Average cost |
|---|---|---|---|---|
| Solar thermal system | System and installation | £3,000 | £6,000 | £4,500 |
| Solar thermal kit | System | £2,000 | £3,000 | £2,500 |
| Last updated: May 2024 Our costs are ballpark averages - get a local tradesperson to quote now | ||||
Solar hot water system cost
Solar thermal technology harnesses clean energy by converting the heat from the sun into hot water. This is ideal for homeowners and businesses alike who want to reduce their carbon emissions and cut down on the costs of fossil fuels.
There are two main types of solar thermal systems:
Active solar water heating systems, which have special devices to convert the sun's energy into hot water
Passive solar water heating systems, which rely on the design of the building itself to absorb solar energy
In this guide, we're looking specifically at active solar thermal systems.
The cost of a solar hot water system will ultimately depend on the type and quality of the solar panels, but you can expect a quote of between £3,000–£6,000 for a typical 5m² thermal collector roof area and 250-litre cylinder
This includes the cost to install a solar hot water system as well as the materials required, including panels, pipes, and a hot water tank
This was part of the The Green Homes Grant that launched in September 2020 and ended in March 2021 (it was due to be March 2022). Homeowners and landlords could apply for vouchers ranging between £5,000–£10,000 in value for energy-saving renovations. Solar thermal panels were also included under the grant scheme.
Note: Most solar hot water systems are just designed to provide the hot water you use for bathing, showering and hot taps, not heating.
Green home grants available in 2026
Looking to make your home more eco-friendly and energy-efficient? Discover the latest green home grants that could help you save money while reducing your carbon footprint.
What is the cost of installing a solar hot water system myself?
It is possible, of course, to purchase a DIY installation kit. If you opt for this route, you can expect the solar domestic hot water system cost to be around £1,750. However, this doesn't take into account the cost of scaffolding, which you will need if you have a two-storey home.
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FAQs
What is the average cost of a solar hot water system?
The average solar hot water heating system cost is £4,500. A checked installer will give you an accurate cost for installation.
How much does a gas boosted solar hot water system cost?
Solar hot water systems aren't usually standalone systems. They usually have a gas backup system to ensure you always have access to hot water (normally a conventional boiler or immersion heater).
Gas boosted models help homeowners get the best of both worlds: lower carbon emissions through a solar water heater and the on-demand performance of a gas water heater.
The cost for installation and materials will usually come to around £4,500. However, this will depend on the complexity of the installation. If scaffolding is required, these costs will be included in the quote. If you can use your existing gas boiler, this will save you money.
How do you install a solar panel?
First and foremost, you will require between 2-5 m² of roof space to install solar panels. The most common installation method is to mount the panels directly to the rafters using specialist roof hooks, frames and clamps. Scaffolding is needed for properties of two storeys, which will increase the total cost.
Is my heating system compatible with a solar thermal system?
If you have a regular heating system that is gravity fed, you'll need to get an extra heat pump or valve so that the system can function properly when the heating is running alongside it.
It's worth noting that solar thermal systems aren't usually compatible with combi boilers as they receive water directly from the mains. If you have a hot water storage cylinder, you'll likely be okay.
Before proceeding, it's worth checking with the manufacturer of your boiler to determine whether it will be compatible with a solar thermal system.
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